What’s Vulnerable › Vulnerabilities

CVE-2021-30501

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-05-27 · updated 2026-06-17
• Weakness: CWE-20

Description

An assertion abort was found in upx MemBuffer::alloc() in mem.cpp, in version UPX 4.0.0. The flow allows attackers to cause a denial of service (abort) via a crafted file.

Affected products

• Fedoraproject Fedora: 33
• Red Hat Enterprise Linux: 7.0
• upx: 4.0.0

References

• https://bugzilla.redhat.com/show_bug.cgi?id=1948696
• https://github.com/upx/upx/commit/28e761cd42211dfe0124b7a29b2f74730f453e46
• https://github.com/upx/upx/issues/486
• https://github.com/upx/upx/pull/487
• https://bugzilla.redhat.com/show_bug.cgi?id=1948696
• https://github.com/upx/upx/commit/28e761cd42211dfe0124b7a29b2f74730f453e46
• https://github.com/upx/upx/issues/486
• https://github.com/upx/upx/pull/487

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